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Title: Tc Chemistry in HLW: Role of Organic Complexants

Abstract

Tc complexation with organic compounds in tank waste plays a significant role in the redox chemistry of Tc and the partitioning of Tc between the supernatant and sludge components in waste tanks. These processes need to be understood so that strategies to effectively remove Tc from high-level nuclear waste prior to waste immobilization can be developed and so that long-term consequences of Tc remaining in residual waste after sludge removal can be evaluated. Only limited data on the stability of Tc-organic complexes exists and even less thermodynamic data on which to develop predictive models of Tc chemical behavior is available. To meet these challenges we are conducting a research program to study to develop thermodynamic data on Tc-organic complexation over a wide range of chemical conditions. We will attempt to characterize Tc-speciation in actual tank waste using state-of-the-art analytical organic chemistry, separations, and speciation techniques to validate our model. On the basis of such studies we will develop credible model of Tc chemistry in HLW that will allow prediction of Tc speciation in tank waste and Tc behavior during waste pretreatment processing and in waste tank residuals.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab., Los Alamos, NM; Pacific Northwest National Lab., Richland, WA (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
834842
Report Number(s):
EMSP-81921-2003
R&D Project: EMSP 81921; TRN: US0407351
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2003
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHEMISTRY; FORECASTING; ORGANIC COMPOUNDS; PROCESSING; RADIOACTIVE WASTES; REMOVAL; RESEARCH PROGRAMS; SLUDGES; STABILITY; TANKS; THERMODYNAMICS; WASTES

Citation Formats

Hess, Nancy S, and Conradsen, Steven D. Tc Chemistry in HLW: Role of Organic Complexants. United States: N. p., 2003. Web. doi:10.2172/834842.
Hess, Nancy S, & Conradsen, Steven D. Tc Chemistry in HLW: Role of Organic Complexants. United States. doi:10.2172/834842.
Hess, Nancy S, and Conradsen, Steven D. Sun . "Tc Chemistry in HLW: Role of Organic Complexants". United States. doi:10.2172/834842. https://www.osti.gov/servlets/purl/834842.
@article{osti_834842,
title = {Tc Chemistry in HLW: Role of Organic Complexants},
author = {Hess, Nancy S and Conradsen, Steven D},
abstractNote = {Tc complexation with organic compounds in tank waste plays a significant role in the redox chemistry of Tc and the partitioning of Tc between the supernatant and sludge components in waste tanks. These processes need to be understood so that strategies to effectively remove Tc from high-level nuclear waste prior to waste immobilization can be developed and so that long-term consequences of Tc remaining in residual waste after sludge removal can be evaluated. Only limited data on the stability of Tc-organic complexes exists and even less thermodynamic data on which to develop predictive models of Tc chemical behavior is available. To meet these challenges we are conducting a research program to study to develop thermodynamic data on Tc-organic complexation over a wide range of chemical conditions. We will attempt to characterize Tc-speciation in actual tank waste using state-of-the-art analytical organic chemistry, separations, and speciation techniques to validate our model. On the basis of such studies we will develop credible model of Tc chemistry in HLW that will allow prediction of Tc speciation in tank waste and Tc behavior during waste pretreatment processing and in waste tank residuals.},
doi = {10.2172/834842},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 2003},
month = {Sun Jun 01 00:00:00 EDT 2003}
}

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